title: Effects of sleeve gastrectomy and ileal transposition, alone and in combination, on food intake, body weight, gut hormones, and glucose metabolism in rats.
abstract: Bariatric surgeries are hypothesized to produce weight loss and improve diabetes control by multiple mechanisms including gastric restriction and lower gut stimulation; the relative importance of these mechanisms remains poorly understood. We compared the effects of a typical foregut procedure, sleeve gastrectomy, (SG) with a primarily hindgut surgery, ileal transposition (IT), alone and together (SGIT), or sham manipulations, on food intake, body weight, gut hormones, glucose tolerance, and key markers of glucose homeostasis in peripheral tissues of adult male Sprague-Dawley rats (450-550 g, n = 7-9/group). SG, IT, and SGIT surgeries produced transient reduction in food intake and weight gain; the effects of SG and IT on intake and body weight were nonadditive. SG, IT, and SGIT surgeries resulted in increased tissue expression and plasma concentrations of the lower gut hormones glucagon-like peptide-1 and peptide YY and decreased plasma glucose-dependent insulinotropic peptide, insulin, and leptin concentrations. Despite transient effects on intake and weight gain, the SG, IT, and SGIT surgeries produced a significant improvement in glucose tolerance. In support of glycemic improvements, the protein abundance of key markers of glucose metabolism (e.g., GLUT4, PKA, IRS-1) in muscle and adipose tissue were increased, whereas the expression of key gluconeogenic enzyme in liver (G-6-Pase) were decreased following the surgeries. Therefore, our data suggest that enhanced lower gut stimulation following SG, IT, and SGIT surgeries leads to transient reduction in food intake and weight gain together with enhanced secretion of lower gut hormones and improved glucose clearance by peripheral tissues.
authors.affiliation: Department of Production Animal Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada;
authors.forename: S
authors.initials: S
authors.lastname: Nausheen
authors.forename: I H
authors.initials: IH
authors.lastname: Shah
authors.forename: A
authors.initials: A
authors.lastname: Pezeshki
authors.forename: D L
authors.initials: DL
authors.lastname: Sigalet
authors.forename: P K
authors.initials: PK
authors.lastname: Chelikani
mesh_terms: D052436:Adipose Tissue, White / Q000378:metabolism; D000818:Animals; D050110:Bariatric Surgery / Q000379:methods*; D015415:Biomarkers / Q000097:blood / Q000378:metabolism; D050260:Carbohydrate Metabolism; D002149:Energy Intake; D005743:Gastrectomy; D005768:Gastrointestinal Hormones / Q000097:blood / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism; D018149:Glucose Intolerance / Q000209:etiology / Q000378:metabolism / Q000473:pathology / Q000517:prevention & control*; D007082:Ileum / Q000378:metabolism / Q000473:pathology / Q000601:surgery*; D007328:Insulin / Q000097:blood / Q000378:metabolism; D000078790:Insulin Secretion; D007413:Intestinal Mucosa / Q000378:metabolism / Q000473:pathology; D020738:Leptin / Q000097:blood / Q000378:metabolism; D008099:Liver / Q000378:metabolism; D008297:Male; D018482:Muscle, Skeletal / Q000378:metabolism; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D014812:Vitamin K / Q000009:adverse effects; D015430:Weight Gain
chemical_list: D015415:Biomarkers; C029401:Ensure Plus; D005768:Gastrointestinal Hormones; D007328:Insulin; D020738:Leptin; D014812:Vitamin K; D005947:Glucose
keywords: body weight; food intake; glucose metabolism; gut hormones; ileal transposition; sleeve gastrectomy